Journal
ASTRONOMY & ASTROPHYSICS
Volume 395, Issue 3, Pages L51-L54Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20021531
Keywords
waves; Sun : photosphere; Sun : chromosphere
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Short-period acoustic waves are thought to supply the energy for the radiative losses of the non-magnetic chromosphere of the Sun and, in general, of late-type stars. Here, we present evidence for the existence of waves in the solar atmosphere with periods in the range of 50s < P < 100 s. Two-dimensional time sequences with a cadence of 25 s were obtained from quiet Sun disk center in Fe I 5434 Angstrom. The observations were performed with the Gottingen Fabry-Perot spectrometer in the Vacuum Tower Telescope at the Observatorio del Teide/Tenerife. They are subjected to speckle reconstruction and to a wavelet analysis. The atmospheric ranges forming the velocity signals are narrowed by linear combinations of Doppler maps from wavelengths near line center. The power in the short-period range is concentrated above intergranular spaces. We estimate an acoustic flux into the chromosphere of approximately 3 x 10(6) erg cm(-2) s(-1), as needed for the chromospheric radiative losses.
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